<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>
    <div id="root">

    </div>
</body>
<script src="../react.js"></script>
<script src="../react-dom.js"></script>
<script src="https://cdn.staticfile.org/babel-standalone/6.26.0/babel.min.js"></script>
<script type="text/babel">
    class App extends React.Component {
        state={
            isShow:true
        }
        render(){
            let {isShow} = this.state;
            return (
                <div>
                {
                   isShow && <h1>好好学习天天向上！！！！</h1> 
                }
                <button onClick={()=>this.changeState()}>切换</button>    
                </div>
            )
        }
        changeState(){
            console.log(this)
            this.setState((state)=>{
                return {
                    isShow:!state.isShow
                }
            })
        }
    }


    ReactDOM.render(<App/>,document.getElementById("root"))
</script>
</html>